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                <h2 id="day2"><a href="#day2" class="headerlink" title="day2"></a>day2</h2><p>spring中基于注解的IOC和ioc的案例</p>
<ol>
<li><p>spring中ioc的常用注解</p>
</li>
<li><p>案例使用xml方式和注解方式实现单表的CRUD操作<br> 持久层技术选择：dbutils</p>
</li>
<li><p>改造基于注解的ioc案例，使用纯注解的方式实现<br> spring的一些新注解使用</p>
</li>
<li><p>spring和Junit整合</p>
</li>
</ol>
<span id="more"></span>

<p>Account案例</p>
<ol>
<li>导入依赖<br>pom.xml</li>
</ol>
<?xml version="1.0" encoding="UTF-8"?>
<p><project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><br>    <modelVersion>4.0.0</modelVersion></p>
<pre><code>&lt;groupId&gt;org.example&lt;/groupId&gt;
&lt;artifactId&gt;com.sqtian.springExample&lt;/artifactId&gt;
&lt;version&gt;1.0-SNAPSHOT&lt;/version&gt;
&lt;packaging&gt;jar&lt;/packaging&gt;

&lt;dependencies&gt;

    &lt;dependency&gt;
        &lt;groupId&gt;org.springframework&lt;/groupId&gt;
        &lt;artifactId&gt;spring-context&lt;/artifactId&gt;
        &lt;version&gt;5.0.2.RELEASE&lt;/version&gt;
    &lt;/dependency&gt;

    &lt;dependency&gt;
        &lt;groupId&gt;commons-dbutils&lt;/groupId&gt;
        &lt;artifactId&gt;commons-dbutils&lt;/artifactId&gt;
        &lt;version&gt;1.4&lt;/version&gt;
    &lt;/dependency&gt;

    &lt;dependency&gt;
        &lt;groupId&gt;mysql&lt;/groupId&gt;
        &lt;artifactId&gt;mysql-connector-java&lt;/artifactId&gt;
        &lt;version&gt;5.1.6&lt;/version&gt;
    &lt;/dependency&gt;
    &lt;dependency&gt;
        &lt;groupId&gt;c3p0&lt;/groupId&gt;
        &lt;artifactId&gt;c3p0&lt;/artifactId&gt;
        &lt;version&gt;0.9.1.2&lt;/version&gt;
    &lt;/dependency&gt;

    &lt;dependency&gt;
        &lt;groupId&gt;junit&lt;/groupId&gt;
        &lt;artifactId&gt;junit&lt;/artifactId&gt;
        &lt;version&gt;4.13&lt;/version&gt;
    &lt;/dependency&gt;
&lt;/dependencies&gt;
</code></pre>
</project>

<hr>
<ol start="2">
<li>创建业务层接口与实现类</li>
</ol>
<p>package com.sqtian.service;</p>
<p>import com.sqtian.domain.Account;</p>
<p>import java.util.List;</p>
<p>&#x2F;**</p>
<ul>
<li>账户的业务层接口</li>
<li> *&#x2F;<br>public interface IAccountService {  &#x2F;**<ul>
<li>查询所有</li>
<li>@return<br>   *&#x2F;<br>  List<Account> findAllAccount();</li>
</ul>
<p>  &#x2F;**</p>
<ul>
<li>找一个</li>
<li>@return<br>   *&#x2F;<br>  Account findAccountById(Integer accountId);</li>
</ul>
<p>  &#x2F;**</p>
<ul>
<li>保存</li>
<li>@param account<br>   *&#x2F;<br>  void saveAccount(Account account);</li>
</ul>
<p>  &#x2F;**</p>
<ul>
<li>改</li>
<li>@param account<br>   *&#x2F;<br>  void updateAccount(Account account);</li>
</ul>
<p>  &#x2F;**</p>
<ul>
<li>删</li>
<li>@param accountId<br>   *&#x2F;<br>  void deleteAccount(Integer accountId);</li>
</ul>
</li>
</ul>
<p>}</p>
<hr>
<p>package com.sqtian.service.impl;</p>
<p>import com.sqtian.dao.IAccountDao;<br>import com.sqtian.domain.Account;<br>import com.sqtian.service.IAccountService;</p>
<p>import java.util.List;</p>
<p>&#x2F;**</p>
<ul>
<li><p>账户的业务层实现类<br> *&#x2F;<br>public class AccountServiceImpl implements IAccountService {</p>
<p> private IAccountDao accountDao;</p>
<p> public void setAccountDao(IAccountDao accountDao) {<br> this.accountDao &#x3D; accountDao;<br> }</p>
<p> public List<Account> findAllAccount() {<br> return accountDao.findAllAccount();<br> }</p>
<p> public Account findAccountById(Integer accountId) {<br> return accountDao.findAccountById(accountId);<br> }</p>
<p> public void saveAccount(Account account) {<br> accountDao.saveAccount(account);<br> }</p>
<p> public void updateAccount(Account account) {<br> accountDao.updateAccount(account);<br> }</p>
<p> public void deleteAccount(Integer accountId) {<br> accountDao.deleteAccount(accountId);<br> }</p>
</li>
</ul>
<h2 id=""><a href="#" class="headerlink" title="}"></a>}</h2><ol start="3">
<li>创建Account实体类<br>package com.sqtian.domain;</li>
</ol>
<p>import java.io.Serializable;</p>
<p>&#x2F;**</p>
<ul>
<li>账户的实体类</li>
<li> *&#x2F;</li>
</ul>
<p>public class Account implements Serializable {<br>    private Integer id;<br>    private String name;<br>    private double balance;</p>
<pre><code>public Integer getId() &#123;
    return id;
&#125;

public void setId(Integer id) &#123;
    this.id = id;
&#125;

public String getName() &#123;
    return name;
&#125;

public void setName(String name) &#123;
    this.name = name;
&#125;

public double getBalance() &#123;
    return balance;
&#125;

public void setBalance(double balance) &#123;
    this.balance = balance;
&#125;

@Override
public String toString() &#123;
    return &quot;Account&#123;&quot; +
        &quot;id=&quot; + id +
        &quot;, name=&#39;&quot; + name + &#39;\&#39;&#39; +
        &quot;, balance=&quot; + balance +
        &#39;&#125;&#39;;
&#125;
</code></pre>
<h2 id="-1"><a href="#-1" class="headerlink" title="}"></a>}</h2><ol start="4">
<li>创建持久层接口和实现类<br>package com.sqtian.dao;</li>
</ol>
<p>import com.sqtian.domain.Account;</p>
<p>import java.util.List;</p>
<p>&#x2F;**</p>
<ul>
<li>持久层接口<br> *&#x2F;</li>
</ul>
<p>public interface IAccountDao {</p>
<pre><code>/**
 * 查询所有
 * @return
 */
List&lt;Account&gt; findAllAccount();

/**
 * 找一个
 * @return
 */
Account findAccountById(Integer accountId);

/**
 * 保存
 * @param account
 */
void saveAccount(Account account);

/**
 * 改
 * @param account
 */
void updateAccount(Account account);

/**
 * 删
 * @param accountId
 */
void deleteAccount(Integer accountId);
</code></pre>
<h2 id="-2"><a href="#-2" class="headerlink" title="}"></a>}</h2><p>package com.sqtian.dao.impl;</p>
<p>import com.sqtian.dao.IAccountDao;<br>import com.sqtian.domain.Account;<br>import org.apache.commons.dbutils.QueryRunner;<br>import org.apache.commons.dbutils.handlers.BeanHandler;<br>import org.apache.commons.dbutils.handlers.BeanListHandler;</p>
<p>import java.sql.SQLException;<br>import java.util.List;</p>
<p>&#x2F;**</p>
<ul>
<li>持久层实现类</li>
<li> *&#x2F;</li>
</ul>
<p>public class AccountDaoImpl implements IAccountDao {</p>
<pre><code>private QueryRunner runner;

//交给spring注入
public void setRunner(QueryRunner runner) &#123;
    this.runner = runner;
&#125;



public List&lt;Account&gt; findAllAccount() &#123;
    try &#123;
        return runner.query(&quot;select * from account&quot;,new BeanListHandler&lt;Account&gt;(Account.class));
    &#125; catch (Exception e) &#123;
        throw new RuntimeException(e);
    &#125;

&#125;


public Account findAccountById(Integer accountId) &#123;
    try &#123;
        return runner.query(&quot;select * from account where id = ?&quot;,new BeanHandler&lt;Account&gt;(Account.class),accountId);
    &#125; catch (Exception e) &#123;
        throw new RuntimeException(e);
    &#125;

&#125;

public void saveAccount(Account account) &#123;
    try &#123;
        runner.update(&quot;insert into account(name,balance)values(?,?)&quot;,account.getName(),account.getBalance());
    &#125; catch (Exception e) &#123;
        throw new RuntimeException(e);
    &#125;
&#125;

public void updateAccount(Account account) &#123;
    try &#123;
        runner.update(&quot;update account set name=?,balance=? where id = ?&quot;,account.getName(),account.getBalance(),account.getId());
    &#125; catch (Exception e) &#123;
        throw new RuntimeException(e);
    &#125;
&#125;

public void deleteAccount(Integer accountId) &#123;
    try &#123;
        runner.update(&quot;delete from account where id = ?&quot;,accountId);
    &#125; catch (Exception e) &#123;
        throw new RuntimeException(e);
    &#125;
&#125;
</code></pre>
<p>}</p>
<hr>
<ol start="5">
<li>配置spring<br>bean.xml</li>
</ol>
<?xml version="1.0" encoding="UTF-8"?>
<p><beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd"></p>
<pre><code>&lt;bean id=&quot;accountService&quot; class=&quot;com.sqtian.service.impl.AccountServiceImpl&quot;&gt;
    &lt;!--注入dao对象--&gt;
    &lt;property name=&quot;accountDao&quot; ref=&quot;accountDao&quot;&gt;&lt;/property&gt;
&lt;/bean&gt;

&lt;bean id=&quot;accountDao&quot; class=&quot;com.sqtian.dao.impl.AccountDaoImpl&quot;&gt;
    &lt;property name=&quot;runner&quot; ref=&quot;runner&quot;&gt;&lt;/property&gt;
&lt;/bean&gt;

&lt;!--配置QueryRunner,如果用单例时,一个要用,另一个可能还没用完,线程受到影响.因此要用多例--&gt;
&lt;bean id=&quot;runner&quot; class=&quot;org.apache.commons.dbutils.QueryRunner&quot; scope=&quot;prototype&quot;&gt;
    &lt;!--注入数据源--&gt;
    &lt;constructor-arg name=&quot;ds&quot; ref=&quot;dataSource&quot;&gt;&lt;/constructor-arg&gt;
&lt;/bean&gt;

&lt;!--配置数据源连接池--&gt;
&lt;bean id=&quot;dataSource&quot; class=&quot;com.mchange.v2.c3p0.ComboPooledDataSource&quot;&gt;
    &lt;!--配置连接数据库的必备信息--&gt;
    &lt;property name=&quot;driverClass&quot; value=&quot;com.mysql.jdbc.Driver&quot;&gt;&lt;/property&gt;
    &lt;property name=&quot;jdbcUrl&quot; value=&quot;jdbc:mysql://localhost:3306/lovelycc?serverTimezone=UTC&quot;&gt;&lt;/property&gt;
    &lt;property name=&quot;user&quot; value=&quot;root&quot;&gt;&lt;/property&gt;
    &lt;property name=&quot;password&quot; value=&quot;root&quot;&gt;&lt;/property&gt;
&lt;/bean&gt;
</code></pre>
</beans>

<hr>
<ol start="6">
<li>创建测试类<br>package com.sqtian.test;</li>
</ol>
<p>import com.sqtian.domain.Account;<br>import com.sqtian.service.IAccountService;<br>import org.junit.Test;<br>import org.springframework.context.ApplicationContext;<br>import org.springframework.context.support.ClassPathXmlApplicationContext;</p>
<p>import java.util.List;</p>
<p>&#x2F;**</p>
<ul>
<li>使用junit单元测试</li>
<li> *&#x2F;</li>
</ul>
<p>public class AccountServiceTest {</p>
<pre><code>@Test
public void testFindAll() &#123;
    //1. 获取容器
    ApplicationContext ac = new ClassPathXmlApplicationContext(&quot;bean.xml&quot;);
    //2. 调用业务层对象
    IAccountService as = ac.getBean(&quot;accountService&quot;,IAccountService.class);
    //3. 执行方法
    List&lt;Account&gt; accounts = as.findAllAccount();
    for (Account account : accounts) &#123;
        System.out.println(account);
    &#125;
&#125;

@Test
public void testFindAllOne() &#123;
    ApplicationContext ac = new ClassPathXmlApplicationContext(&quot;bean.xml&quot;);
    IAccountService as = ac.getBean(&quot;accountService&quot;, IAccountService.class);

    Account accountById = as.findAccountById(1);
    System.out.println(accountById);
&#125;

@Test
public void testSave() &#123;
    ApplicationContext ac = new ClassPathXmlApplicationContext(&quot;bean.xml&quot;);
    IAccountService as = ac.getBean(&quot;accountService&quot;, IAccountService.class);
    Account account = new Account();
    account.setName(&quot;CC&quot;);
    account.setBalance(7000);
    account.setUid(25);
    as.saveAccount(account);

&#125;

@Test
public void testUpdate() &#123;
    Account account = new Account();
    account.setName(&quot;CCTT&quot;);
    account.setBalance(7000);
    account.setUid(20);
    account.setId(5);
    ApplicationContext ac = new ClassPathXmlApplicationContext(&quot;bean.xml&quot;);
    IAccountService as = ac.getBean(&quot;accountService&quot;, IAccountService.class);
    as.updateAccount(account);
&#125;

@Test
public void testDelete() &#123;

    ApplicationContext ac = new ClassPathXmlApplicationContext(&quot;bean.xml&quot;);
    IAccountService as = ac.getBean(&quot;accountService&quot;, IAccountService.class);
    as.deleteAccount(5);
&#125;
</code></pre>
<h2 id="-3"><a href="#-3" class="headerlink" title="}"></a>}</h2><p>&#x2F;**</p>
<ul>
<li>账户的业务层实现类</li>
<li>业务层调用持久层</li>
<li></li>
<li>注解实现IOC</li>
<li>用于创建对象的</li>
<li><pre><code>他们的作用就和在xml配置文件中编写一个&lt;bean&gt;&lt;/bean&gt;标签实现的功能是一样的
</code></pre>
</li>
<li><pre><code>    Component
</code></pre>
</li>
<li><pre><code>        作用: 用于把当前类的对象存入spring容器中
</code></pre>
</li>
<li><pre><code>        属性:
</code></pre>
</li>
<li><pre><code>            value, 用于指定bean的id,不写时默认是当前类名,且首字母小写
</code></pre>
</li>
<li></li>
<li><pre><code>    Controller
</code></pre>
</li>
<li><pre><code>        一般用在表现层
</code></pre>
</li>
<li><pre><code>    Service
</code></pre>
</li>
<li><pre><code>        一般用在业务层
</code></pre>
</li>
<li><pre><code>    Repository
</code></pre>
</li>
<li><pre><code>        一般用在持久层
</code></pre>
</li>
<li><pre><code>    以上三个注解的作用和属性与Component是一模一样的
</code></pre>
</li>
<li><pre><code>    他们三个是spring框架为我们提供的三层使用的注解，使我们的三层对象更清晰
</code></pre>
</li>
<li></li>
<li></li>
<li>用于注入数据的</li>
<li><pre><code>和在xml配置文件中的bean标签写一个&lt;property&gt;&lt;/property&gt;标签的作用是一样的
</code></pre>
</li>
<li><pre><code>    Autowired
</code></pre>
</li>
<li><pre><code>        作用：自动按照类型注入，只要容器中有唯一一个bean对象类型和要注入的变量类型匹配，就可以注入成功，没有则报错
</code></pre>
</li>
<li><pre><code>        出现位置可以是变量上，也可以是方法上
</code></pre>
<ul>
<li><pre><code>    Qualifier
</code></pre>
<ul>
<li><pre><code>        作用：在按照类型注入的基础上再按照名称注入。给类成员注入时不能单独使用。但是在给方法参数注入时可以。
</code></pre>
<ul>
<li><pre><code>    Resource
</code></pre>
<ul>
<li><pre><code>        作用：直接按照bean的id注入，可以独立使用
</code></pre>
<ul>
<li><pre><code>        属性：name，用于指定id
</code></pre>
<ul>
<li><pre><code>    以上三个注解都只能注入其他bean类型的数据，而基本类型和String类型无法使用上述注解实现
</code></pre>
<ul>
<li><pre><code>    另外，集合类型的注入只能通过xml来实现
</code></pre>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li></li>
<li>用于改变作用范围</li>
<li><pre><code>和在bean标签中使用scope属性实现的功能一样
</code></pre>
</li>
<li><pre><code>    Scope
</code></pre>
</li>
<li><pre><code>        用于指定bean的作用范围
</code></pre>
</li>
<li><pre><code>        属性： value指定范围的取值 常用取值：singleton、prototype
</code></pre>
</li>
<li></li>
<li>和生命周期相关 （了解）</li>
<li><pre><code>和在bean标签中使用init-method和destroy-method作用一样
</code></pre>
<ul>
<li><pre><code>    PreDestroy
</code></pre>
<ul>
<li><pre><code>        用于指定销毁方法
</code></pre>
<ul>
<li><pre><code>    PostConstruct
</code></pre>
<ul>
<li><pre><code>        用于指定初始化方法
</code></pre>
 *&#x2F;</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
<h2 id="通过注解的方式优化账户案例"><a href="#通过注解的方式优化账户案例" class="headerlink" title="通过注解的方式优化账户案例"></a>通过注解的方式优化账户案例</h2><ol>
<li>修改配置文件约束</li>
</ol>
<p>bean.xml</p>
<?xml version="1.0" encoding="UTF-8"?>
<p><beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd"></p>
<pre><code>&lt;context:annotation-config/&gt;

&lt;!--告知spring在创建容器时要扫描的包--&gt;
&lt;context:component-scan base-package=&quot;com.sqtian&quot;&gt;&lt;/context:component-scan&gt;
&lt;!--配置QueryRunner,如果用单例时,一个要用,另一个可能还没用完,线程受到影响.因此要用多例--&gt;
&lt;bean id=&quot;runner&quot; class=&quot;org.apache.commons.dbutils.QueryRunner&quot; scope=&quot;prototype&quot;&gt;
    &lt;!--注入数据源--&gt;
    &lt;constructor-arg name=&quot;ds&quot; ref=&quot;dataSource&quot;&gt;&lt;/constructor-arg&gt;
&lt;/bean&gt;

&lt;!--配置数据源连接池--&gt;
&lt;bean id=&quot;dataSource&quot; class=&quot;com.mchange.v2.c3p0.ComboPooledDataSource&quot;&gt;
    &lt;!--配置连接数据库的必备信息--&gt;
    &lt;property name=&quot;driverClass&quot; value=&quot;com.mysql.jdbc.Driver&quot;&gt;&lt;/property&gt;
    &lt;property name=&quot;jdbcUrl&quot; value=&quot;jdbc:mysql://localhost:3306/lovelycc?serverTimezone=UTC&quot;&gt;&lt;/property&gt;
    &lt;property name=&quot;user&quot; value=&quot;root&quot;&gt;&lt;/property&gt;
    &lt;property name=&quot;password&quot; value=&quot;root&quot;&gt;&lt;/property&gt;
&lt;/bean&gt;
</code></pre>
</beans>

<hr>
<ol start="2">
<li>给实现类添加注解</li>
</ol>
<p>&#x2F;**</p>
<ul>
<li>账户的业务层实现类<br> *&#x2F;</li>
</ul>
<p>@Service(“accountService”)<br>public class AccountServiceImpl implements IAccountService {</p>
<pre><code>//只有一个需要注入，可以用autowired注解，通过注解的方式注入可以不需要set方法
@Autowired
private IAccountDao accountDao;

public List&lt;Account&gt; findAllAccount() &#123;
    return accountDao.findAllAccount();
&#125;

public Account findAccountById(Integer accountId) &#123;
    return accountDao.findAccountById(accountId);
&#125;

public void saveAccount(Account account) &#123;
    accountDao.saveAccount(account);
&#125;

public void updateAccount(Account account) &#123;
    accountDao.updateAccount(account);
&#125;

public void deleteAccount(Integer accountId) &#123;
    accountDao.deleteAccount(accountId);
&#125;
</code></pre>
<h2 id="-4"><a href="#-4" class="headerlink" title="}"></a>}</h2><p>&#x2F;**</p>
<ul>
<li>持久层实现类</li>
<li> *&#x2F;</li>
</ul>
<p>@Repository(“accountDao”)<br>public class AccountDaoImpl implements IAccountDao {</p>
<pre><code>@Autowired
private QueryRunner runner;




public List&lt;Account&gt; findAllAccount() &#123;
    try &#123;
        return runner.query(&quot;select * from account&quot;,new BeanListHandler&lt;Account&gt;(Account.class));
    &#125; catch (Exception e) &#123;
        throw new RuntimeException(e);
    &#125;

&#125;


public Account findAccountById(Integer accountId) &#123;
    try &#123;
        return runner.query(&quot;select * from account where id = ?&quot;,new BeanHandler&lt;Account&gt;(Account.class),accountId);
    &#125; catch (Exception e) &#123;
        throw new RuntimeException(e);
    &#125;

&#125;

public void saveAccount(Account account) &#123;
    try &#123;
        runner.update(&quot;insert into account(name,balance,uid)values(?,?,?)&quot;,account.getName(),account.getBalance(),account.getUid());
    &#125; catch (Exception e) &#123;
        throw new RuntimeException(e);
    &#125;
&#125;

public void updateAccount(Account account) &#123;
    try &#123;
        runner.update(&quot;update account set name=?,balance=?,uid = ? where id = ?&quot;,account.getName(),account.getBalance(),account.getUid(),account.getId());
    &#125; catch (Exception e) &#123;
        throw new RuntimeException(e);
    &#125;
&#125;

public void deleteAccount(Integer accountId) &#123;
    try &#123;
        runner.update(&quot;delete from account where id = ?&quot;,accountId);
    &#125; catch (Exception e) &#123;
        throw new RuntimeException(e);
    &#125;
&#125;
</code></pre>
<h2 id="-5"><a href="#-5" class="headerlink" title="}"></a>}</h2><h2 id="全注解的方式"><a href="#全注解的方式" class="headerlink" title="全注解的方式"></a>全注解的方式</h2><p>不需要bean.xml了<br>新建配置类</p>
<p>package config;</p>
<p>import org.springframework.context.annotation.*;</p>
<p>&#x2F;**</p>
<ul>
<li>该类是一个配置类，其作用和bean.xml是一样的</li>
<li>spring中的新注解</li>
<li>Configuration</li>
<li><pre><code>作用: 指定当前类是一个配置类
</code></pre>
</li>
<li><pre><code>细节: 当配置类作为AnnotationConfigApplicationContext对象创建的参数时,该注解可以不写
</code></pre>
</li>
<li><pre><code>        ApplicationContext ac = new AnnotationConfigApplicationContext(SpringConfiguration.class);
</code></pre>
</li>
<li></li>
<li>ComponentScan</li>
<li><pre><code>作用:用于通过注解指定spring在创建容器时要扫描的包
</code></pre>
</li>
<li><pre><code>属性:
</code></pre>
</li>
<li><pre><code>    value: 它和basePackages的作用是一样的,都是用于指定创建容器时要扫描的包
</code></pre>
</li>
<li><pre><code>           我们使用此注解就等同于在xml中配置了     &lt;context:component-scan base-package=&quot;com.sqtian&quot;&gt;&lt;/context:component-scan&gt;
</code></pre>
</li>
<li></li>
<li>Bean</li>
<li><pre><code>作用: 用于把当前方法的返回值作为bean对象存入spring的ioc容器中
</code></pre>
</li>
<li><pre><code>属性:
</code></pre>
</li>
<li><pre><code>    name: 用于指定bean的id,当不写时,
</code></pre>
</li>
<li><pre><code>细节:
</code></pre>
</li>
<li><pre><code>    当我们使用注解配置方法时,如果方法有参数,spring框架会去容器中查找有没有可用的bean对象.
</code></pre>
</li>
<li><pre><code>    查找方式和和Autowired注解的作用一样.
</code></pre>
</li>
<li></li>
<li><pre><code>Import
</code></pre>
</li>
<li><pre><code>    作用: 用于导入其他的配置类
</code></pre>
</li>
<li><pre><code>    属性:
</code></pre>
</li>
<li><pre><code>        value: 用于指定其他配置类的字节码
</code></pre>
</li>
<li><pre><code>                当我们使用Import的注解之后,有Import注解的类叫父配置类,而导入的都是子配置类
</code></pre>
</li>
<li></li>
<li>PropertySource</li>
<li><pre><code>    作用: 用于指定properties文件的位置
</code></pre>
</li>
<li><pre><code>    属性:
</code></pre>
</li>
<li><pre><code>        value: 指定文件的名称和路径
</code></pre>
</li>
<li><pre><code>                关键字: classpath. 表示到类路径下
</code></pre>
 *&#x2F;</li>
</ul>
<p>@Configuration<br>@ComponentScan(“com.sqtian”)<br>@Import(JdbcConfig.class)<br>@PropertySource(“classpath:JdbcConfig.properties”)<br>public class SpringConfiguration {</p>
<pre><code>//用于写公共配置
</code></pre>
<p>}</p>
<hr>
<p>package config;</p>
<p>import com.mchange.v2.c3p0.ComboPooledDataSource;<br>import org.apache.commons.dbutils.QueryRunner;<br>import org.springframework.beans.factory.annotation.Qualifier;<br>import org.springframework.beans.factory.annotation.Value;<br>import org.springframework.context.annotation.Bean;<br>import org.springframework.context.annotation.Scope;</p>
<p>import javax.sql.DataSource;</p>
<p>public class JdbcConfig {</p>
<pre><code>//注上配置文件里的key
@Value(&quot;$&#123;jdbc.driver&#125;&quot;)
private String driver;
@Value(&quot;$&#123;jdbc.url&#125;&quot;)
private String url;
@Value(&quot;$&#123;jdbc.username&#125;&quot;)
private String username;
@Value(&quot;$&#123;jdbc.password&#125;&quot;)
private String password;



/**
 * 用于创建一个QueryRunner对象
 * 需要实现多例
 * @param dataSource
 * @return
 */
@Bean(name = &quot;runner&quot;)
@Scope(&quot;prototype&quot;)
public QueryRunner createQueryRunner(@Qualifier(&quot;dataSource&quot;) DataSource dataSource)&#123;  //当有多个数据源时,可以用Qualifier指定id
    return new QueryRunner(dataSource);
&#125;

/**
 * 创建数据源对象
 * @return
 */
@Bean(&quot;dataSource&quot;)
public DataSource creatDatasource()&#123;
    try &#123;
        ComboPooledDataSource ds = new ComboPooledDataSource();
        ds.setDriverClass(driver);
        ds.setJdbcUrl(url);
        ds.setUser(username);
        ds.setPassword(password);

        return ds;
    &#125; catch (Exception e) &#123;
        throw new RuntimeException(e);
    &#125;

&#125;
</code></pre>
<h2 id="-6"><a href="#-6" class="headerlink" title="}"></a>}</h2><p>JdbcConfig.properties</p>
<p>jdbc.driver&#x3D;com.mysql.jdbc.Driver<br>jdbc.url&#x3D;jdbc:mysql:&#x2F;&#x2F;localhost:3306&#x2F;lovelycc?serverTimezone&#x3D;UTC<br>jdbc.username&#x3D;root<br>jdbc.password&#x3D;root</p>
<hr>
<pre><code>@Test
public void testFindAll() &#123;
    //1. 获取容器
</code></pre>
<p>&#x2F;&#x2F;		ApplicationContext ac &#x3D; new ClassPathXmlApplicationContext(“bean.xml”);</p>
<pre><code>    ApplicationContext ac = new AnnotationConfigApplicationContext(SpringConfiguration.class);
    //2. 调用业务层对象
    IAccountService as = ac.getBean(&quot;accountService&quot;,IAccountService.class);
    //3. 执行方法
    List&lt;Account&gt; accounts = as.findAllAccount();
    for (Account account : accounts) &#123;
        System.out.println(account);
    &#125;
&#125;
</code></pre>
<h2 id="结合junit"><a href="#结合junit" class="headerlink" title="结合junit"></a>结合junit</h2><p>&#x2F;**</p>
<ul>
<li>使用junit单元测试<ul>
<li><pre><code>Spring整合junit的配置
</code></pre>
<ul>
<li><pre><code>    1. 导入spring整合junit的jar
</code></pre>
<ul>
<li><pre><code>    2. 使用junit提供的一个注解把原有的main方法替换了,替换成spring提供的@Runwith
</code></pre>
<ul>
<li><pre><code>    3. 告知spring的运行器,spring和ioc创建是基于xml还是注解的,并且说明位置
</code></pre>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li><pre><code>        @ContextConfiguration
</code></pre>
</li>
<li><pre><code>            location: 指定xml文件的位置,加上classpath关键字,表示在类路径下
</code></pre>
</li>
<li><pre><code>            classes: 指定注解类所在位置
</code></pre>
<ul>
<li><pre><code>    当我们使用spring 5.x版本时, junit必须对应4.12及以上
</code></pre>
<ul>
<li> *&#x2F;</li>
</ul>
</li>
</ul>
</li>
</ul>
<p>@RunWith(SpringJUnit4ClassRunner.class)<br>@ContextConfiguration(classes &#x3D; SpringConfiguration.class)</p>
<p>&#x2F;&#x2F;如果用bean.xml配置<br>&#x2F;&#x2F;@ContextConfiguration(location&#x3D; “classpath:bean.xml”)<br>public class AccountServiceTest {</p>
<pre><code>@Autowired
private IAccountService as;

//创建容器的代码交给spring实现,直接用as
@Test
public void testFindAll() &#123;
    //3. 执行方法
    List&lt;Account&gt; accounts = as.findAllAccount();
    for (Account account : accounts) &#123;
        System.out.println(account);
    &#125;
&#125;
</code></pre>
<h2 id="-7"><a href="#-7" class="headerlink" title="}"></a>}</h2><pre><code>     &lt;dependency&gt;
        &lt;groupId&gt;org.springframework&lt;/groupId&gt;
        &lt;artifactId&gt;spring-test&lt;/artifactId&gt;
        &lt;version&gt;5.0.2.RELEASE&lt;/version&gt;
    &lt;/dependency&gt;
</code></pre>
<h2 id="开发人员"><a href="#开发人员" class="headerlink" title="开发人员"></a>开发人员</h2><p>public class AccountServiceTest {</p>
<pre><code>@Autowired
private ApplicationContext ac;
private IAccountService as;

@Before
public void init()&#123;
    //1. 获取容器
    ac = new AnnotationConfigApplicationContext(SpringConfiguration.class);
    //2. 调用业务层对象
    as = ac.getBean(&quot;accountService&quot;,IAccountService.class);
&#125;

@Test
public void testFindAll() &#123;
    //3. 执行方法
    List&lt;Account&gt; accounts = as.findAllAccount();
    for (Account account : accounts) &#123;
        System.out.println(account);
    &#125;
&#125;
</code></pre>
<h2 id="-8"><a href="#-8" class="headerlink" title="}"></a>}</h2>
                
            </div>
            <hr/>

            

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